How to Make Home Security Alarm

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About: Hello Guys, I am techgenie, an Electronics hobbyists, tech tinker and developer. I dedicate my free time in designing and making various creative and innovative projects, RC toys, Incredible Gadgets, Awesome...

Before the inception of smartphones, people used the old keypad phones that were very sturdy and offered tremendously long battery life. In the last decade, Mobile technology has evolved at a rapid pace and everyone now use a smartphone leaving the old phone on its fate. Have you ever wondered what can be done with an old mobile phone probably still lying somewhere in your junk drawer gathering dust?

In this Instructable, i decided to use an old mobile phone to make a simple Home Security Alarm which is very useful and easy to make DIY gadget. This is one of a cool things that can be done with old cell phones. Any working phone with keypad that has speed dialing feature can be used to make this Security Alarm System.

Let's Begin..

Step 1: Watch the Video

There is no better tool than a detailed video tutorial to understand the procedure. However, it is also recommended to visit next steps for additional information and images.

Step 2: Required Materials

Almost all the parts can be found at home yet i will provide links to few of the parts that are available online.

Ebay.com

  1. Neodymium Magnets - https://rover.ebay.com/rover/1/711-53200-19255-0/1...
  2. Double sided tape - https://rover.ebay.com/rover/1/711-53200-19255-0/1...
  3. Soldering Iron - https://rover.ebay.com/rover/1/711-53200-19255-0/1...
  4. Hot glue gun - https://rover.ebay.com/rover/1/711-53200-19255-0/1...
  5. Stationary Knife - https://rover.ebay.com/rover/1/711-53200-19255-0/1...

Amazon.com

  1. Neodymium Magnets - https://amzn.to/2TQ6ZMX
  2. Double sided tape - http://amzn.to/2npM6rb
  3. Soldering Iron - http://amzn.to/2r3IX6g
  4. Hot glue gun - https://amzn.to/2Sf7oad
  5. Stationary Knife - http://amzn.to/2q879jK

Amazon.in

  1. Neodymium Magnets - https://amzn.to/2Csqa7T
  2. Double sided tape - http://amzn.to/2n9SjLI
  3. Soldering Iron - http://amzn.to/2qC47qG
  4. Hot glue gun - http://amzn.to/2rjNE9r
  5. Stationary Knife - http://amzn.to/2q1kb6M

From Home and Local Store: Old Mobile phone, Enamel copper wire, plastic cloth clip, two conductive screws, cardboard and a plastic card.

Step 3: Prepare the Phone

  • Permanently turn Off the Keypad lock on the cell phone.
  • Turn On the speed dialing feature on the phone.
  • Assign a key to the speed dial and remember the key. (I used key no. 2)
  • Set the assigned key on speed dial to your mobile number.
  • After verifying all the settings, turn the device Off.

Step 4: Configure the Hardware

  • Disassemble the phone and separate the circuit board.
  • Clean any dust over the circuit and the keypad.
  • Carefully peel off the button sticker from the keypad.
  • Take two pieces of enameled copper wire.
  • Remove the enamel insulation from both the ends.
  • Solder the wires to both the terminals of a key to which a speed dial was assigned.
  • Remove the conductive plate from the button sticker of the corresponding key.
  • Paste the button sticker over the circuit board again.
  • Make sure that all the keys work well except the key on which the wires are soldered.
Note: It is advisable to watch the video to avoid any doubts and understand the procedure well.

Step 5: Prepare Contact Mechanism

  • Remove the enamel insulation from the other ends of the wires.
  • Take two conductive metal screws.
  • Tie the each wire to a metal screw as shown in the image above.
  • Drill a hole at the end of a plastic cloth clip.
  • Insert both the screws in the holes of the cloth clip, so that they can make good contact with each other.
  • Cut a small piece of cardboard and paste the cell phone over the cardboard.
  • Also, paste the cloth clip over the cardboard slightly above the cell phone as shown in the image.

Step 6: Make Magnetic Attachment

We now need to make a mechanism that can be pulled automatically, so as to activate the speed dialing feature of the phone.

  • Cut a small piece of non-conductive plastic card. (An expired Credit card can be used)
  • Heat the card from the middle and bend it at an angle of 90°.
  • The plastic will retain its shape when cooled down.
  • Using Hot glue, paste a strong neodymium magnet over the card.
  • Attach another magnet over the pasted magnet and insert it between the cloth clip.
  • Paste some double sided tape at the back of cardboard.
  • Apply some hot glue over the magnet and paste the system over the edge of a door as shown in the image above.
  • The other magnet will stick to the wooden edge and it will form a locking mechanism between the two magnets.

Step 7: Testing

  • Our Home Security Alarm is now ready.
  • Whenever you leave your house and someone opens the door, the card will be pulled out from the cloth clip due to the magnetic attraction and you will receive a call on your phone.
  • In this way, you will instantly know if someone has enter your home without your permission.
  • If you enter the house, all you need to do is cut the call that the security system will dial to your cell phone.

So Friends, this here concludes the instructable, if you like my project kindly support me by subscribing to my youtube channel GOODTECH - Creativity And Science.

Stay tuned and also follow me on Instructabes to receive regular updates. Kindly leave your valuable suggestions and feedback in the comments section below. You can also connect with me on through social media, Facebook, Twitter and Instagram.

Note: If you like this Instructable, please vote for it...Thanks..:)

Thanks for your Support..!!

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    26 Discussions

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    jobogaert

    25 days ago

    how do I put the card in place when I'm outside, or how do I go outside after I put the card in place?

    2 replies
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    jobogaerttroggo

    Reply 24 days ago

    AAH! sorry, had only read the article, phone is too slow to watch video, seen on pc now.

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    RaymondR6

    Question 27 days ago

    If you do have an old cellphone available for the project, don't you need to have it working with an active account so it can call? If the phone is inactive, how can it dial your number? And if it is an analog phone, are you sure your carrier will activate an account for it?

    2 answers
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    rstewart3RaymondR6

    Answer 25 days ago

    If you have a smart phone that is inactive, you can download an app that allows it to make calls for free via wifi. It would require you to have wifi though.

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    TechgenieRaymondR6

    Answer 27 days ago

    Yes, you are right. This project only works with a working cell phone that is also active to make calls.

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    Techgeniesparkleponytx

    Reply 26 days ago

    Thank you very much...your appreciation does matter a lot..:)

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    sanek760

    27 days ago

    It is possible that an attentive burglar immediately realises what is it for, so it is necessary to hide phone (without an outer case I think) into (maybe) door jamb and put the breaker on the door somewhere near the door hinge.

    1 reply
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    Techgeniesanek760

    Reply 26 days ago

    Yes, you are right. Its design and placement needs much more work.

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    TechgenieIshan__

    Answer 26 days ago

    Yes any thin insulated wire can be used which doesn't restrict closing of the cell phone.

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    cordovox

    27 days ago

    Great project. This idea could be added to any other alarm system. An alarm trigger from any other sensor could be use to initiate a phone call.

    1 reply
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    Techgeniecordovox

    Reply 26 days ago

    Yes, you are right....it would be wonderful and there are already many such products available in market.

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    bserinese

    26 days ago

    This is a great idea and reminds me how I used to hack computer keyboards create custom buttons to interact with programs. I'd do something similar with soldering buttons and switches to different parts of the keyboard control board. Someone smarter than me could write a program to send yourself a text or email if you switch was tripped. Very creative.

    1 reply
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    Techgeniebserinese

    Reply 26 days ago

    Thanks...getting some appreciation does help a lot..:)

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    jnjani

    26 days ago

    This could be the simplest YET brilliant project / idea.

    1 reply
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    Techgeniejnjani

    Reply 26 days ago

    Thanks a lot..I am glad you like it..:)